To find out what percentage of 8 is 3, simply divide 3 by 8 and multiply by 100. The answer is 37.5%. This can be useful when doing things like budgeting or calculating percentages off of a total. For example, if you have a bill that costs $80 and wants to find out what 20% off would be, you would multiply 80 by 0.2 to get 16. Subtracting 16 from 80 would give you the answer of 64. Therefore, 20% off of $80 would be $64.